That second link seems to be CF. It states that the bulb is 7200k. What are you planning to grow in the tank? Not sure if 9w would be enough since the wpg rule apply to nanos. You can try one of those desk lamps from homedepot. I've read many success with them. I'm still new so don't take my word on it. Maybe someone with more experience can help ya. Good luck!

I have two (of the second one) and I don't like them. Since they clip on to one side of the tank, the lighting is sort of uneven. It'll give you low light over a 2.5g if you manage to center the light somehow.

Oh, I had to modify the clip part to accommodate for the rim on my tank.

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